The Portuguese Rheumatoid Arthritis Impact of Disease (RAID) score and its measurement equivalence in three countries: validation study using Rasch Models.

ABSTRACT:

Purpose

The Rheumatoid Arthritis Impact of Disease (RAID) score assesses seven impact domains of interest for people with RA. This study aimed to test patients' understanding of the Portuguese RAID and evaluate its cross-cultural validity for use in Portugal.

Methods

This was a mixed methods study comprising two phases: (i) cognitive debriefing to determine patient's comprehension of the Portuguese RAID and (ii) cross-cultural validation using Rasch analysis. Construct validity was determined by fit to the model, invariance culture (compared with France and UK datasets) and evidence of convergent and divergent validity.

Results

Patients' input (n = 38) led to minor changes in the phrasing of two items to ensure conceptual equivalence between the Portuguese and the ori

SUBMITTER: Ferreira RJO 

PROVIDER: S-EPMC6208571 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature